, new commando-style raids across the u.s. and europe. brian ross has the latest. >>> and, wrestle mania. they've kicked, jumped and flipped their way into the hearts of millions of americans. now, pro wrestling hat its sights set on a really big audience. and that's a "sign of the times." >> announcer: from the global resources of abc news, with terry moran, cynthia mcfadden and bill weir in new york city, this is "nightline," september 28th, 2010. >> good evening, i'm cynthia mcfadden. we begin tonight with a shocking look behind some of the most popular nonfiction films of our time. nature documentaries. these films seek to deliver a sense of wonder at the quirkry private behavior of some of the colorful characters in the animal kingdom. the problem, according to a long-time industry veteran we interviewed tonight, is that some of the most incredible scenes are 100% fake. john donvan has our report. >> reporter: animals on the screen. we love them. beethoven in the movie of that name. lassi, in the classic tv show. and then, of course, there is flipper. all of whom were, we knew, esse